BIL 330 Lecture Notes - Lecture 2: Beta Diversity, Alpha Diversity, Gamma Diversity
4 Sep 2018
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Incorporates both species richness and evenness: higher number indicates more diversity, scales of diversity, alpha diversity, local diversity within a uniform habitat, average number of species within habitats, ex. Miami: beta diversity, among habitat diversity, measured as a rate of species turnover between habitats, often expressed as gamma/alpha diversity, high beta diversity = high diversity difference. Jaccard similarity: beta diversity between two communities. Includes number of species in common and number of species that do not overlap: range: 0 (different) to 1 (same, gamma diversity, number of species observed in all habitats within a region, ex. Florida: patterns in species diversity, species-area relationship, the bigger the area, the greater number of species, this is due to sampling (local), habitat variation (country/continent), and unique evolutional lineages across continents (globe) Idea is that niches in tropics do not overlap as much: macarthur"s warblers all feed on same part of tree, middle part, outer part, etc) .
